I read the last book in this series first, but it doesn’t matter too much, because they’re linked but don’t follow the exact same characters. This book features Clem and Rowley, and it’s a delight: Clem’s obvious ADHD and the way he and Rowley work with that in their relationship, and also the way that the sex scenes are not just “insert tab A into slot B”, but have feeling and thought behind them and don’t feel mechanistic at all. I’m not interested in the tab A/slot B type, but when it deepens characters’ relationships, and especially when it isn’t a mechanical write-by-numbers scene, it can still be worth reading — and such is the case here. I remember the same being true of An Unsuitable Heir.
It’s an enjoyable romance on its own, and the mystery adds a little, but I do think you might need to read all three books to really find the mystery satisfying. I need to read the middle book, and I’m honestly curious about how those two characters meet and get along, because from their appearances in this book and the third… nope!
If you’re not a fan of m/m romance at all, this won’t be for you, but if you’re looking for something in that genre which is thoughtful with rich characters, this should qualify admirably.